OHCI - meaning and definition. What is OHCI
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What (who) is OHCI - definition

SOFTWARE INTERFACE
UHCI; EHCI; Universal Host Controller Interface; OHCI; Open Host Controller Interface; Enhanced Host Controller Interface; Host Controller Interface (USB); Host Controller Interface (FireWire); HCI (FireWire); HCI (USB)

OHCI         
OHCI         
? Host Controller Interface (Reference: USB, Compaq, OPTI, Apple, UHCI)
UHCI         
Universal Host Controller Interface (Reference: USB, Intel, VIA, OHCI)

Wikipedia

Host controller interface (USB, Firewire)

A host controller interface (HCI) is a register-level interface that enables a host controller for USB or IEEE 1394 hardware to communicate with a host controller driver in software. The driver software is typically provided with an operating system of a personal computer, but may also be implemented by application-specific devices such as a microcontroller.

On the expansion card or motherboard controller, this involves much custom logic, with digital logic engines in the motherboard's controller chip, plus analog circuitry managing the high-speed differential signals. On the software side, it requires a device driver (called a Host Controller Driver, or HCD).